\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{CCES Experiment of OLS Models of Confidence in Attribution, v1}
\begin{tabular}{l*{5}{c}}
\hline\hline
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}&\multicolumn{1}{c}{(5)}\\
                    &\multicolumn{1}{c}{Base}&\multicolumn{1}{c}{Controls}&\multicolumn{1}{c}{Democrats}&\multicolumn{1}{c}{Independents}&\multicolumn{1}{c}{Republicans}\\
\hline
Supportive Endorsement&       1.524\sym{***}&       1.712\sym{***}&       1.916\sym{***}&       2.237\sym{**} &       1.412\sym{***}\\
                    &      (5.41)         &      (6.31)         &      (4.58)         &      (2.84)         &      (3.75)         \\
[1em]
Independent Endorsement&       0.318         &      0.0787         &      -0.383         &       1.030         &       0.219         \\
                    &      (1.06)         &      (0.27)         &     (-0.83)         &      (1.03)         &      (0.58)         \\
[1em]
Supportive Endorsement $\times$ Independent Endorsement&    0.000668         &     -0.0859         &       0.764         &      -1.298         &      -0.696         \\
                    &      (0.00)         &     (-0.21)         &      (1.21)         &     (-0.99)         &     (-1.28)         \\
[1em]
College             &                     &      0.0518         &      -0.102         &       0.633         &     0.00760         \\
                    &                     &      (0.25)         &     (-0.32)         &      (0.91)         &      (0.03)         \\
[1em]
Age in Years        &                     &      0.0221\sym{***}&     0.00708         &      0.0726\sym{***}&      0.0285\sym{**} \\
                    &                     &      (3.44)         &      (0.71)         &      (3.74)         &      (3.20)         \\
[1em]
White               &                     &      -0.355         &      -0.293         &      -0.988         &       0.256         \\
                    &                     &     (-1.35)         &     (-0.80)         &     (-1.36)         &      (0.54)         \\
[1em]
Perception of Iranian Threat&                     &      0.0180\sym{**} &      0.0297\sym{**} &   0.0000306         &     0.00823         \\
                    &                     &      (2.88)         &      (3.00)         &      (0.00)         &      (0.97)         \\
[1em]
Female              &                     &       0.149         &      -0.181         &       1.575\sym{*}  &       0.152         \\
                    &                     &      (0.72)         &     (-0.56)         &      (2.43)         &      (0.54)         \\
[1em]
Democrat=1          &                     &      -0.966\sym{**} &                     &                     &                     \\
                    &                     &     (-2.99)         &                     &                     &                     \\
[1em]
Republican=1        &                     &       1.112\sym{***}&                     &                     &                     \\
                    &                     &      (3.32)         &                     &                     &                     \\
[1em]
Constant            &       5.346\sym{***}&       4.507\sym{***}&       4.439\sym{***}&       1.337         &       4.968\sym{***}\\
                    &     (26.69)         &      (9.65)         &      (7.38)         &      (1.16)         &      (7.03)         \\
\hline
Observations        &         597         &         491         &         234         &          61         &         196         \\
\hline\hline
\multicolumn{6}{l}{\footnotesize \textit{t} statistics in parentheses}\\
\multicolumn{6}{l}{\footnotesize \sym{*} \(p<0.05\), \sym{**} \(p<0.01\), \sym{***} \(p<0.001\)}\\
\end{tabular}
\end{table}
